## Product of Sum

In the tutorial about the Sum-of-Product (SOP) expression, we saw that it represents a standard Boolean (switching) expression which “Sums” two or more “Products” by taking the output from two or more logic AND gates and OR’s them together to create the final output. But we can also take the outputs of two or more OR gates and…

## How to Interface OLED Display with ESP32? ESP32 OLED Display Tutorial

In this tutorial, we will learn how to interface an OLED Display Module with ESP32 Development Board. The OLED Graphic Display used in this project is based on SSD1306 OLED Driver IC and communicates over SPI. Use ESP32 with OLED to display Text, Bitmap Images, Graphics etc., in your DIY…

## How to Interface PCF8574 I2C LCD with ESP8266 NodeMCU?

In this tutorial, we will learn how to interface an I2C LCD with ESP8266 NodeMCU Development Board. The PCF8574 I2C LCD is a special module for 16×2 and 20×4 Character LCD Displays. We will learn how the ESP8266 NodeMCU I2C LCD interface works, how to configure I2C in ESP8266 NodeMCU…

## Switching Theory

Switching Theory allows us to understand the operation and relationship between Boolean Algebra and two-level logic functions with regards to Digital Logic Gates. Switching theory can be used to further develop the theoretical knowledge and concepts of digital circuits when viewed as an interconnection of input elements producing an output state…

## Sum of Product

Boolean Algebra is a simple and effective way of representing the switching action of standard logic gates and a set of rules or laws have been invented to help reduce the number of logic gates needed to perform a particular logical operation. Boolean Algebra is the digital logic mathematics we…

## DeMorgan’s Theorem

As we have seen previously, Boolean Algebra uses a set of laws and rules to define the operation of a digital logic circuit with “0’s” and “1’s” being used to represent a digital input or output condition. Boolean Algebra uses these zeros and ones to create truth tables and mathematical…